Envelop.



L. W. MECKSTROTH.

ENVELOP.

APPLICATION FILED JUNE 15. 1916.

1 Q89,858o Patented Dec. 31, 1918. l7y-i.

' @MZ V-VMWMM nae mums runs :0, Win10 urnm. wsnmcmu. n. c

entree snares rarnnr FFIQE.

LOUIS W. MECKSTROTH, OF CHICAGO, ILLINOIS.

ENVELOP.

To all whom it may concern:

Be it known that I, LoUIsNV. MECKSTROTH, a, citizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvements in Envelops, of which the following is a specification.

My invention relates to envelope, and more particularly to envelops adapted to be sent through the mails unsealed. The object of my improvement is the construction of simple and efiicient means for reinforcing the loose flaps of the above mentioned envelops. Other objects will appear hereinafter.

An embodiment of my invention is illustrated in the accompanying drawing form ing a part of this specification; and in which Figure 1 is a plan view of a blank used to form an envelop embodying my invention.

Fig. 2 is a section of the completed envelop with parts broken away to expose underlying portions; and,

Fig. 3 is an. enlarged fragmental section taken on line 33 of Fig. 2.

My invention is capable of embodiment in envelops of various forms and sizes, and composed of any desirable thickness of material. For convenience, I have shown an envelop rectangular in form and of greater length than its width. In the envelop shown, a sheet of paper, or other desirable material, is cut out substantially as shown in Fig. 1. The blank is folded along dotted lines 5, 6, 7 and 8, so that the-rectangular portion 9 within said lines forms the front of the envelop, or the part which usually bears the address. The portions 10, 11 and 12, outside of the lines 6, 7 and 8, are folded over portion 9 to form the back of the envelop. The portion 11 is gummed, as at 13, and the portion 12 gummed, as at 14, for

securing the portions 10, 11 and 12 together.

This is the usual form of securing an envelop together, but may be varied. when so desired.

The portion 15 outside of line 5 forms the loose flap of the envelop, or the flap which is not secured, and which is adapted to hold the articles or insert in the envelop. The portion or flap 15 is provided with extensions 16 at its lateral edges, which when the flap 15 is folded in the envelop, are doubled back upon said flap for reinforcing the latter. The extensions 16 are preferably Specification of Letters Patent.

Application filed June 15, 1916.

PatentedDec. 31, 1918.

Serial No. 103,801.

formed integral with the flap 15, and port1onsl0 and 12. This construction also adds to the strength of they connection between the flap 15 and the rest of the envelop.

In building up my envelop from a blank, such as shown in Fig. 1, the material to be contained in the envelop when formed, is placed upon the portion 9, as the blank lies in the position indicated in Fig. 1. The flap 15 with its extensions 16 are folded on line 5 over on top of the insert, which has not been shown in the drawing, to a position indicated by dotted lines 15'. The portion 10 is next folded on top of the insert and over portion 9. The gum 13 is moistened, and portion 15 folded on line 7 on the end of portion 10, and secured thereto by means of the gum 13. The gum 14 is next moistened, and portion 12 folded on line 8 on portions 11 and 10. The gum 14 holds the portion 12 in proper position. In this manner the envelop may be built uparound an insert.

When it is desired to manufacture the envelops for subsequent insertion of the matter to be sent by mail I prefer that the flap 15 be first folded on the line 5 to the position indicated by the dotted lines 15 and then the flap 10 folded over onto the body portion 9 along the line 6, after which the flap 11 is folded on the line 7 over on top of the flap 10 and gum fastened thereto in any desired manner, leaving the flap 12 free to be gum fastened onto the flap 10 or both the latter and the flap 11 after the insert has been placed in the envelop betweenthe free edge of the flap 10 and the inner surface of the body portion 9.

With this arrangement the extensions 16 are folded on the lines 6v and 8 over on flap 15, providing a double thickness of the latter at its edges and double portions at the lines 6 and 8. This doubling of the paper greatly strengthens the fiap against bending, and the connection between the extensions 16 and the portions 10 and 12 further strengthen the flap 15 against bending on its line 5. It will thus be seen that the contents are securely held within the envelop, any tendency of such contents from being forced out of the envelop being resisted by the reinforcing folded sections while the latter remain in the inwardly projecting positions. However, the loose flap 15 may easily be withdrawn manually from its dotted line position 15 to the full line position shown in Fi l, but assuming that the envelop is assem led in the previously described manner. When the flap is in its Obviously those skilled in the art can make various changes in the details and arrangement of parts without departing from the spirit and scope of my invention as defined by the claims, and I desire therefore not to be limited to the precise constructions herein disclosed.

I claim 1. An envelop comprising front and back walls; a loose flap connected at one edge of the front wall; and extensions attached along the lateral edges of the loose flap, folded back upon said loose flap and attached to the back wall strengthening the connection of said loose'flap, said loose flap and extensions being free from adhesives and free to be moved repeatedly in between and out from said front and rear walls without tearing any part of the envelop.

2. An envelop comprising a sheet of ma- I terial folded along two sets of parallel lines providing a substantially rectangular front wall inside of said lines and four flaps outside of said lines disposed on said front wall forming a back wall, three of said flaps be- 111g secured together and the fourth flap being loosely disposed under the end portions of two of the other flaps; and an extension attached to each lateral edge of the loose flap and end edges of the two flaps adjacent said loose flap reinforcing the connection of the latter, said loose flap and extensions being adapted for repeated folding into and out of the envelop without tearing any part of such envelop.

3. 'An envelop comprising front and rear walls attached together throughout both lateral and one of the end edges of the envelop; a loose flap attached to the front wall and having its lateral edges substantially parallel with the lateral edges of said front and rear walls; and an extension attached along each lateral edge of said flap, folded back flat upon said fiapand attached to said rear wall adapted to reinforce the connection between the flap and said walls, said flap and extensions being free to be moved into and out from between said walls a plurality of times without mutilating any part of the envelop.

' In testimony whereof I have signed my name to this specification, on this 13th day of June, A. D. 1916. v

LOUIS w. MEOKSTROTH,

Witnesses:

CHAS. M. NISSEN, CHARLES H. SEEM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. s 

